Billet Aluminum Pulley Kit for 390, 427 & 428 FE engines. Pulley provides 87% underdrive ratio when used with CVF Racing crankshaft pulley. Designed for use with stock power steering and alternator brackets. Fits engines without casted V-Groove in dampener. 3 Bolt pattern on crankshaft pulley and dampener face to water pump flange face is 2 3/8”. Ford Pulley Kit Contents: Water Pump Pulley P/N BBFE2WP Grooves: 2 Pulley Diameter: 6.2" Pilot Diameter: 0.625" Crankshaft Pulley: P/N BBFE2CR Grooves: 2 Crank Pulley Diameter: 5.4" Crank Pulley Bolt Pattern: 3 Bolt Alternator Pulley: P/N ALTFAN Diameter: 2.7" Alternator Shaft Diameter: 11/16"